CN111812572A - External VFTO measurement calibration system - Google Patents
External VFTO measurement calibration system Download PDFInfo
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- CN111812572A CN111812572A CN202010739080.8A CN202010739080A CN111812572A CN 111812572 A CN111812572 A CN 111812572A CN 202010739080 A CN202010739080 A CN 202010739080A CN 111812572 A CN111812572 A CN 111812572A
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- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
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Abstract
The utility model belongs to the technical field of electric power parameter measurement, a calibration system is measured to outside VFTO is related to, and there is the structure complicacy, with high costs and the not good problem of adaptability in current outside VFTO measurement calibration system. The application provides calibration system is measured to outside VFTO includes: the device comprises an electric field signal acquisition module, a probe driving module, an optical fiber transmission module and a data processing calibration module; the electric field signal acquisition module comprises an electric field acquisition bulb and a signal transmission rod, and the electric field acquisition bulb is connected with the signal transmission rod; the signal transmission rod is connected with the probe driving module, the probe driving module is connected with the optical fiber transmission module, and the optical fiber transmission module is connected with the data processing calibration module. The GIS insulation breakdown accident reduction device is relatively simple in structure, low in cost, wide in application range, high in measurement accuracy, small in interference degree, and capable of achieving great economic benefits for reducing GIS insulation breakdown accidents and guaranteeing safe operation of an electric power system.
Description
Technical Field
The application relates to the technical field of power parameter measurement, in particular to an external VFTO measurement calibration system.
Background
As the voltage class increases, internal overvoltages, especially Very Fast Transient Overvoltages (VFTO), generated by routine operations of isolation switches in GISs pose a significant threat to the insulation of electrical equipment such as GISs. Currently, the actual measurement work of the over-voltage waveform parameters and the amplitude characteristics (slightly) is less developed and is mainly limited by the measurement technology. The calibration of the VFTO measuring system is a key technical problem and a gap for restricting VFTO field measurement and field work, the pulse type steep wave calibration method is also a technical problem acknowledged in the industry, the problem to be solved is the problem of tracing the source of the accurate-grade quantity value, and the problem to be solved lays a foundation for the field actual measurement, research measurement, calibration measurement, quality technical supervision and the like of the steep wave overvoltage.
In the prior art, the measurement method of VFTO includes an internal measurement method and an external measurement method, wherein the internal measurement method mainly uses a built-in electric field probe to obtain an overvoltage signal, and a resistance-free sensor is directly connected to a GIS breaker end cover. The high-voltage arm consists of a high-voltage bus of the GIS and an upper polar plate of the capacitance probe; the low-voltage arm is composed of a capacitance probe and a GIS pipe shell through an insulating medium, and the measured steep-front overvoltage is the voltage value of a point where the sensor is installed. The disadvantage of this method is that the test layout procedure is relatively cumbersome and not easy to measure. For the measurement of external VFTO, an electric field probe was passed. An electric field sensor is adopted to measure external VFTO at a high-voltage inlet of the transformer, and after multiple tests, the amplitude value of 1.5-2.5 pu is obtained, the frequency is within 60MHz, and the voltage peak value caused by the DS operation of the main transformer side is the largest, particularly at a bus connected with the main transformer side.
The existing external VFTO measuring device has the problems of complex structure, high cost and poor adaptability.
Disclosure of Invention
The application provides an outside VFTO measures calibration system to there is the problem that the structure is complicated, with high costs and adaptability is not good in the current outside VFTO measuring device of solution.
The technical scheme adopted by the application is as follows:
an external VFTO measurement calibration system comprising: the device comprises an electric field signal acquisition module, a probe driving module, an optical fiber transmission module and a data processing calibration module;
the electric field signal acquisition module comprises an electric field acquisition bulb and a signal transmission rod, and the electric field acquisition bulb is connected with the signal transmission rod;
the signal transmission rod is connected with the probe driving module, the probe driving module is connected with the optical fiber transmission module, and the optical fiber transmission module is connected with the data processing calibration module.
Optionally, the optical fiber transmission module includes an optical signal output unit and an optical signal receiving unit connected through an optical fiber, the optical signal output unit is connected with the probe driving module, and the optical signal receiving unit is connected with the data processing calibration module.
Optionally, the optical signal receiving unit further comprises a telescopic insulating rod, and two ends of the telescopic insulating rod are respectively and fixedly connected with the optical signal output unit and the optical signal receiving unit.
Optionally, the optical signal output unit includes an electrical signal receiver, a first modem, and an optical transmitter, which are connected in sequence, where the electrical signal receiver is configured to receive an electrical signal sent by the probe driving module, convert the electrical signal into an optical signal through the first modem, and couple and output the optical signal to the optical fiber through the optical transmitter;
the optical signal receiving unit comprises an optical detector, a second modem and an electric signal transmitter which are sequentially connected, wherein the optical detector receives an optical signal in an optical fiber and transmits the optical signal to the second modem to be converted into an electric signal, and then the electric signal is transmitted to the data processing calibration module through the electric signal transmitter.
Optionally, the digital signal processing system further comprises an oscilloscope, the oscilloscope is used for displaying the waveform of the digital signal, and the oscilloscope is connected with the data processing calibration module.
Optionally, the first modem performs the electrical-optical conversion by using a method of direct modulation of a laser diode.
Optionally, a pre-equalization circuit is used in the first modem to compensate for nonlinearity of the laser diode, a driving circuit of the laser diode converts an input voltage signal into a current signal for driving the laser diode, a current bias circuit is used to provide a constant current to the laser diode, so that the laser diode operates in a linear region of electro-optical conversion, and then an electrical signal is converted into an optical signal.
Optionally, the optical detector includes a preamplifier and a main amplifier, the preamplifier is a low-noise broadband transimpedance amplifier, the preamplifier converts a weak current signal generated by the PIN into a voltage signal with a smaller amplitude, the voltage signal is further amplified by the main amplifier, level shifting is performed to meet the requirement of a circuit interface, and the second modem converts an optical signal into an electrical signal and transmits the electrical signal to the data processing calibration module.
The technical scheme of the application has the following beneficial effects:
the GIS insulation breakdown accident reduction device is relatively simple in structure, low in cost, wide in application range, high in measurement accuracy, small in interference degree, and capable of achieving great economic benefits for reducing GIS insulation breakdown accidents and guaranteeing safe operation of an electric power system. The optical fiber transmission module is adopted, so that the data transmission is more accurate, and the high-fidelity effect is achieved; in addition, the telescopic insulating rod is favorable for reserving a safe distance during measurement, so that interference is prevented on one hand, and the safety of measurement is guaranteed on the other hand.
Drawings
In order to more clearly explain the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of one embodiment of the present application;
FIG. 2 is a schematic structural diagram of another embodiment of the present application;
FIG. 3 is a schematic diagram of a fiber optic transmission module of the present application;
illustration of the drawings:
the system comprises a 1-electric field signal acquisition module, a 11-electric field acquisition ball head, a 12-signal transmission rod, a 2-probe driving module, a 3-optical fiber transmission module, a 31-optical signal output unit, a 311-electric signal receiver, a 312-first modem, a 313-optical transmitter, a 32-optical signal receiving unit, a 321-optical detector, a 322-second modem, a 323-electric signal transmitter, a 33-telescopic insulating rod, a 4-data processing calibration module and a 5-oscilloscope.
Detailed Description
Reference will now be made in detail to embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following examples do not represent all embodiments consistent with the present application. But merely as exemplifications of systems and methods consistent with certain aspects of the application, as recited in the claims.
Referring to fig. 1, a schematic structural diagram of an embodiment of the present application is shown.
The application provides an external VFTO measures calibration system includes: the device comprises an electric field signal acquisition module 1, a probe driving module 2, an optical fiber transmission module 3 and a data processing calibration module 4;
the electric field signal acquisition module 1 comprises an electric field acquisition bulb 11 and a signal transmission rod 12, wherein the electric field acquisition bulb 11 is connected with the signal transmission rod 12;
the signal transmission rod 12 is connected with the probe driving module 2, the probe driving module 2 is connected with the optical fiber transmission module 3, and the optical fiber transmission module 3 is connected with the data processing calibration module 4.
Optionally, the optical fiber transmission module 3 includes an optical signal output unit 31 and an optical signal receiving unit 32 connected through an optical fiber, the optical signal output unit 31 is connected with the probe driving module 2, and the optical signal receiving unit 32 is connected with the data processing calibration module 4.
Referring to fig. 2, in this embodiment, the optical fiber transmission module 3 employs an optical signal output unit 31 and an optical signal receiving unit 32 connected by optical fibers, and is a split type, and reserves a safe measurement distance by the length of the optical fibers, while considering the transmission accuracy of measurement data.
Optionally, the optical signal transmission device further comprises a telescopic insulating rod 33, and two ends of the telescopic insulating rod 33 are respectively and fixedly connected to the optical signal output unit 31 and the optical signal receiving unit 32.
Referring to fig. 2, by providing the retractable insulating rod 33, the storage is facilitated, and during actual measurement, the retractable insulating rod 33 is extended, which is beneficial to the safe measurement.
Optionally, the optical signal output unit 31 includes an electrical signal receiver 311, a first modem 312 and an optical transmitter 313, which are connected in sequence, where the electrical signal receiver 311 is configured to receive an electrical signal sent by the probe driving module 2, convert the electrical signal into an optical signal through the first modem 312, and couple and output the optical signal to an optical fiber through the optical transmitter 313;
the optical signal receiving unit 32 includes an optical detector 321, a second modem 322, and an electrical signal transmitter 323, which are connected in sequence, where the optical detector 321 receives an optical signal in an optical fiber, transmits the optical signal to the second modem 322 to convert the optical signal into an electrical signal, and transmits the electrical signal to the data processing calibration module 4 through the electrical signal transmitter 323.
Referring to fig. 3, in this embodiment, through the conversion of the electrical-optical signals, optical fibers may be used to perform long-distance high-fidelity signal transmission, and then the optical signals are converted into electrical signals, which facilitates the processing of the signals.
Optionally, the device further comprises an oscilloscope 5, wherein the oscilloscope 5 is used for displaying the waveform of the digital signal, and the oscilloscope 5 is connected with the data processing calibration module 4.
Optionally, the first modem 312 performs electrical-to-optical conversion by using a laser diode direct modulation method.
Optionally, a pre-equalization circuit is used in the first modem 312 to compensate for the nonlinearity of the laser diode, a driving circuit of the laser diode converts an input voltage signal into a current signal for driving the laser diode, a current bias circuit is used to provide a constant current to the laser diode, so that the laser diode operates in a linear region of electro-optical conversion, and then an electrical signal is converted into an optical signal.
Optionally, the optical detector 321 includes a preamplifier and a main amplifier, the preamplifier is a low-noise broadband transimpedance amplifier, the preamplifier converts a weak current signal generated by the PIN into a voltage signal with a smaller amplitude, and then further amplifies the voltage signal by the main amplifier, and then performs level shifting to meet the requirement of a circuit interface, and the second modem 322 converts an optical signal into an electrical signal and transmits the electrical signal to the data processing calibration module 4.
The PIN in this embodiment is a photo detection circuit known to those skilled in the art. In the application, the data processing calibration module 4 performs data noise reduction and smoothing processing, and then transmits the data to the oscilloscope 5, and the high-frequency oscilloscope 5 displays a change curve of an instantaneous value of a measured signal. The oscilloscope 5 can be used for observing the waveform curve of various signal amplitudes along with time, and can also be used for testing various electric quantities, such as voltage, current, frequency, phase difference, amplitude regulation and the like.
The GIS insulation breakdown accident reduction device is relatively simple in structure, low in cost, wide in application range, high in measurement accuracy, small in interference degree, and capable of achieving great economic benefits for reducing GIS insulation breakdown accidents and guaranteeing safe operation of an electric power system. The optical fiber transmission module 3 is adopted, so that the data transmission is more accurate, and the effect of high fidelity is achieved; in addition, the telescopic insulating rod 33 is favorable for reserving a safe distance during measurement, so that interference is prevented on one hand, and the safety of measurement is guaranteed on the other hand.
The embodiments provided in the present application are only a few examples of the general concept of the present application, and do not limit the scope of the present application. Any other embodiments extended according to the scheme of the present application without inventive efforts will be within the scope of protection of the present application for a person skilled in the art.
Claims (8)
1. An external VFTO measurement calibration system, comprising: the device comprises an electric field signal acquisition module, a probe driving module, an optical fiber transmission module and a data processing calibration module;
the electric field signal acquisition module comprises an electric field acquisition bulb and a signal transmission rod, and the electric field acquisition bulb is connected with the signal transmission rod;
the signal transmission rod is connected with the probe driving module, the probe driving module is connected with the optical fiber transmission module, and the optical fiber transmission module is connected with the data processing calibration module.
2. An external VFTO measurement calibration system as claimed in claim 1, wherein the optical fiber transmission module comprises an optical signal output unit and an optical signal receiving unit connected via optical fiber, the optical signal output unit is connected with the probe driving module, and the optical signal receiving unit is connected with the data processing calibration module.
3. The external VFTO measurement calibration system of claim 2, further comprising a retractable insulating rod, wherein both ends of the retractable insulating rod are fixedly connected to the optical signal output unit and the optical signal receiving unit, respectively.
4. The external VFTO measurement calibration system as claimed in claim 3, wherein the optical signal output unit comprises an electrical signal receiver, a first modem and an optical transmitter connected in sequence, the electrical signal receiver is configured to receive the electrical signal sent by the probe driving module, convert the electrical signal into an optical signal through the first modem, and couple and output the optical signal to the optical fiber through the optical transmitter;
the optical signal receiving unit comprises an optical detector, a second modem and an electric signal transmitter which are sequentially connected, wherein the optical detector receives an optical signal in an optical fiber and transmits the optical signal to the second modem to be converted into an electric signal, and then the electric signal is transmitted to the data processing calibration module through the electric signal transmitter.
5. The external VFTO measurement calibration system according to claim 1, further comprising an oscilloscope for displaying the waveform of the digital signal, wherein the oscilloscope is connected to the data processing calibration module.
6. An external VFTO measurement calibration system as claimed in claim 4, wherein said first modem is electro-optically converted using laser diode direct modulation.
7. An external VFTO measurement calibration system as claimed in claim 6, wherein a pre-equalization circuit is used in the first modem to compensate for the non-linearity of the laser diode, the laser diode driving circuit converts the input voltage signal into a current signal for driving the laser diode, and a current bias circuit is used to provide a constant current to the laser diode to operate in the linear region of the electro-optic conversion, and then converts the electrical signal into an optical signal.
8. An external VFTO measurement calibration system as claimed in claim 4, wherein the optical detector includes a preamplifier and a main amplifier, the preamplifier is a low noise broadband transimpedance amplifier, the preamplifier converts the weak current signal generated by the PIN into a voltage signal with a smaller amplitude, then further amplifies the voltage signal by the main amplifier, and then level shifts the voltage signal to meet the requirements of the circuit interface, and the second modem converts the optical signal into an electrical signal and transmits the electrical signal to the data processing calibration module.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010739080.8A CN111812572A (en) | 2020-07-28 | 2020-07-28 | External VFTO measurement calibration system |
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| CN202010739080.8A CN111812572A (en) | 2020-07-28 | 2020-07-28 | External VFTO measurement calibration system |
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| CN103105521A (en) * | 2013-01-29 | 2013-05-15 | 华北电力大学 | Very fast transient overvoltage (VFTO) remote measurement system and method |
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Application publication date: 20201023 |